Abstract

In long-baseline stellar interferometry, spectrometers are used to disperse starlight for measuring visibility at multiple wavelengths and for fringe tracking with channeled spectra. However, neither prisms nor gratings are well suited to the observation of fringes with wide spectral bandwidths because the mapping from wave number to detector coordinate is nonlinear. The visibility-measurement and fringe-tracking performance are affected by nonlinearity, and in many cases it is important to compensate for this. Longitudinal-dispersion correctors may be used to compensate for differential air paths in an interferometer, and we show that these may also be used to correct the nonlinear mapping of a spectrometer.

© 1996 Optical Society of America

Bandwidth limitations and dispersion in optical stellar interferometry

Peter R. Lawson
Appl. Opt. 35(25) 5122-5124 (1996)

Dispersion in stellar interferometry: simultaneous optimization for delay tracking and visibility measurements

John Davis, William J. Tango, and Erik D. Thorvaldson
Appl. Opt. 37(22) 5132-5136 (1998)

Dispersion in stellar interferometry

William J. Tango
Appl. Opt. 29(4) 516-521 (1990)

Application of geometric phase techniques to stellar interferometry

William J. Tango and John Davis
Appl. Opt. 35(4) 621-623 (1996)

Group-delay tracking in optical stellar interferometry with the fast Fourier transform

Peter R. Lawson
J. Opt. Soc. Am. A 12(2) 366-374 (1995)